Sir Arthur Conan Doyle and Houdini are dear friends although the issue of spiritualism often causes them to argue. Doyle arranges a seance with a famed medium. Houdini plans to expose the medium as a fraud, but he doesn't count on the woman's cleverness. Sparks fly as the two battle with Sir Arthur and a woman reporter on the sidelines. Ultimately, Doyle and Houdini have a stormy scene and the magician finds he must retreat before the medium's skill and intelligence. They make a strange pact: to stay as far away from one another as possible. If Houdini behaves, she won't reveal his secret-- he believes Sherlock Holmes is a real person.